Research scientist Caitlyn Lindsey is convinced that someone is taking out her team one by one. First, a friend and research partner was killed in a home invasion. Three months ago, her boss died in a suspicious car accident. Four days ago, another partner supposedly committed suicide. And now Caitlyn herself has miraculously survived a hit-and-run. Afraid for her life with nowhere to turn, she reaches out to one of the victim's husbands, Detective Josh Solomon. 

After a harrowing attempt on a judge's life at the courthouse, Deputy US Marshals Madison James and Jonas Quinn are tasked with finding a missing woman and an endangered child in connection to the murder of the judge's wife. What seems like a straightforward case becomes hopelessly tangled when the marshals discover that the woman they are searching for is in witness protection and the Amber Alert put out for the missing child has put two lives in danger. Madison and Jonas are forced into a race to find the woman and the child before the men who want her dead discover her location.

During Garrett Addison's first week on the job as a criminal investigator for the Tennessee Bureau of Investigation, his team is called out to a murder scene of a young girl. She's the third victim in a string of disappearances with one thing in common - a Polaroid photo of each victim left behind at the crime scene. The FBI is pulled into the case to help, and Garrett finds himself working with Special Agent Jordan Lambert, the woman he once loved.

US Marshals Madison James and Jonas Quinn are thrust into a high-profile case when they are called on to transport two prisoners across the country on a private plane. But when the plane experiences engine trouble en route from the Pacific Northwest to Colorado, the pilots crash-land the aircraft deep in the heart of the sprawling Salmon-Challis National Forest. When Madison and Jonas regain consciousness, they find both pilots and one prisoner dead - and one fugitive on the run. 

When FBI agent Jack Shannon arrives in Corpus Christi, Texas, he is focused on one thing: finding the man who has been selling encrypted government secrets to the Chinese through online birding chat rooms. But when a senator is shot during a hunting trip and the woman he was with is abducted, Jack agrees to join the search - especially when he discovers that the kidnapping victim is Aubrey Grayson, a woman he was once in love with. As the search continues, it becomes clear the senator may not have been the intended victim....

When one Coast Guard officer is found dead and another goes missing, Coast Guard Investigative Service special agent Finn Walker faces his most dangerous crime yet. His only clues are what little evidence remains aboard the dead officer's boat, and the direction the clues point to will test Finn and the Guard to their limits. When investigative reporter - and Finn's boss's sister - Gabby Rowley arrives, her unrelenting questions complicate an already volatile situation. Now that she's back, the tug on Finn's heart is strong.

Former FBI Special Agent Jack Tanner is working as a detective in Montana when he comes across a body in the national forest during a search and rescue mission. He's committed to finding the killer, even if it means working alongside his old flame, US Forest Service Special Agent Terra Connors. When Terra discovers that the murder victim had ties to a powerful and dangerous trafficker of archaeological artifacts, the investigation takes a deadly turn - one that hits too close to home.

CIA analyst Brynn Taylor developed a new program to combat terrorism, and she invited members of foreign intelligence agencies to America to foster cooperation between countries. Now one of them, Egyptian spy Remon Riad, is missing. Jack Hudson has been working for the Strategic Neutralization and Protection Agency for almost nine years and takes the lead in hunting down the missing spy. But he isn’t at all pleased to find out Brynn is involved.

After a harrowing experience with an obsessed patient, oncology nurse practitioner Leigh Weston needed a change. She thought she'd left her troubles behind when she moved home to Carrington, North Carolina, and took a job in the emergency department of the local hospital. But when someone tampers with her brakes, she fears the past has chased her into the present. She reaches out to her high school friend turned homicide investigator, Ryan Parker, for help. Ryan finds satisfaction in his career, but his favorite way to use his skills is as a volunteer underwater investigator.

When State Department attorney Vivian Steele witnesses two ambassadors collapse as if poisoned at a diplomatic dinner in Washington, DC, she is recruited to be a member of a joint FBI task force assigned to investigate. But she soon finds her by-the-book ways clashing with a special agent in the Diplomatic Security Service, Jacob Cruz. A former Navy SEAL and in charge of the event's security, Jacob takes the attack personally and is driven to act quickly, even ahead of the rules and regulations.  

As a forensic genealogist, Willow Anderson is following in her late grandfather's footsteps in her quest for answers about a baby abducted from the hospital more than 20 years ago. The case may be cold, but things are about to heat up when someone makes an attempt on her life to keep her from discovering the truth. Ex-FBI agent - and Willow's ex-flame - Austin McKade readily offers his help to protect the woman he never should have let get away.

She faces dangerous situations all the time.... Olympic downhill skier, Harper Young, knows what it’s like to look danger in the face. After all, she does it every time she races down a ski slope. She’s fine with that danger and even excels under the pressure, winning Olympic gold. And as a governor’s daughter, she’s familiar with receiving threats from the general public. But when a stalker turns his sights on Harper, she possesses zero skills to protect herself.

Honorably discharged from the Army after an explosion nearly killed her, former military psychiatrist Brooke Adams has set up shop to help others - but her days of helping military personnel are over. She's got her own battles to fight from her time overseas, and she's not equipped to take on more. Former Army Special Ops Sergeant First Class Asher James could handle anything war sent his way - terrorists, bombs, bullets. The only thing that scares him now is sleep. Finally convinced that he needs help, Asher makes an appointment with a counselor.

When a local woman goes missing and Sheriff Blake Jenkins delivers her blood sample to DNA expert Emory Steele for analysis, Blake discovers Emory is a dead ringer for the missing woman. Blake’s gut says the woman is related to Emory. But Emory rejects the notion, requiring a DNA test before she’ll concede that she does indeed have a twin sister she never knew about.

Forensic artist Hannah Perry's taking a much-needed vacation on a secluded island with her young son. But a young woman has been murdered - her body unidentified, her skull recently discovered by the police - and Hannah feels compelled to help find the killer. She decides to work on the reconstruction in the evenings while her son sleeps. But as the woman's face takes shape, an assailant invades Hannah's cabin and tries to end her life.